Fritz bender and michael kxmmerer



UNITED STATES PATENT OFFICE.

FRITZ BENDER AND MICHAEL KAMMERER, OF MI IHLHEIM-ON-THE-MAIN, GERMANY,ASSIGNORS TO A. LEONHARDT & CO.) OF SAME PLACE.

YELLOW-RED DYE.

SPECIFICATION forming part of Letters Patent No. 489,623, dated January10, 1893.

Application filed February 1'7, 1892. Serial No. 421,867. ($peoimens.)Patented in England January 21, 1892, No. 1,231, and

in France January 29, 1892. No. 219,023.

To all whom, it may concern: ish fluorescence. In its chemicalproperties Be it known that we, FRITZ 'BENDER and it is similar to thecorresponding dyestuffs MICHAEL KAMMERER, both subjects of the eitherobtained from monoalkylized meta- Emperor of Germany, residents atMiihlheimamidophenols or obtained by alkylating par- 5 on-the-Maiu,Germany, have invented a new tially the corresponding derivatives ofmetaand useful Improvement in Coloring-Matter, amidophenol itself. (forwhich patents have been obtained with To fully illustrate our inventionwe give our consent in England, No. 1,231, dated Jan uthe followingexample. Eight kilos of rhodaary 21, 1892, and in France, No. 219,023,dated mine derived from succinic acid are dissolved I0 January 29,1892,) of which the following is a in four hundred liters of water andtwenty specification. liters of acetic acid and to the cold solution aWe have found that the pink to bluish red solution of four kilosofpermanganateof potasbasic coloring matters derived from dialkylsium inone hundred liters of water is gradumetaamidophenols (such as therhodamines ally added, the mass being well stirred dur- I5 ofdialkylmetaamidophenol or dialkylmetaing the addition of the oxidizingagent. The

amidocresol and phthalic acid, or derived oxidation is already effectedin the cold. The from succinic acid or formic acid or the pink liquid isthen boiled and filtered and when coloring matters which are the subjectof cooled down (afterarenewed filtration if nec- United States PatentNo. 415,684 granted to essary) the coloringmatter is precipitatedwith 2cFritz Bender, February 3, 1891, or the benchloride of zinc and commonsalt. If in this zoines when treated with strong oxidizing process weemploy less permanganate we obagents are transformed into other coloringtain ainorebluish red product. If we employ matters of a more yellowishred tint. As oxitoo much of the oxidizing agent the whole of dizingagents permanganate of potassium has the dyestufi will be graduallydestroyed.

25 given the best results but peroxide of man- What we claim as ourinvention is:

ganese or of lead together with dilute sul- 1. The process oftransforming the bluish phuric acid and heat would also do. reddyestuffs derived from dialkylmetaami- Instead of using in this processthe bluish dophenols, such as mentioned in the specifired coloringmatters themselves their procation or their corresponding leuco-com- 3oducts of reduction (or leuco-compounds) may pounds, into other coloringmatter of a more be employed. In this case the leuco-comyellowish redtint, which consists in treating pounds are first transformed into thecorresaid compound by an oxidizing agent, such sponding coloring matterswhich by further as potassium permanganate, and separating oxidationyield the yellowish red compounds. the color, substantially asdescribed.

35 It is possible thus by varying the quantities 2. The yellowish redcoloring matter deof the oxidizing agent employed to change rived fromdialkylmetaamido phenols, which the original bluish red tints more orless into dissolves in water or spirit yielding scarlet yellowish redones. The coloring matter obsolutions showing a brilliant greenishfluorestained in such a way has the following charcence, dissolving insulphuric acid giving a 40 acteristics. It is of a basic nature formingyellowish solution which by diluting with wasalts only with acids. It issoluble in water ter turns from orange into scarlet. or spirit yieldingscarlet solutions showing a In testimony whereof we have signed ourbrilliant greenish fluorescence. In concennames to this specification inthe presence of trated sulphuric acid it is dissolved giving a twosubscribing witnesses.

5 yellowish solution which by diluting with wa- FRITZ BENDER.

ter turns from orange into scarlet. It is MICHAEL KAMMERER. principallyadapted for dyeing and printing Witnesses: mordanted or unmordantedcotton and silk, FRANZ HAPLACHER, the latter dyed therewith showing ayellow- FRIEDRICH CoRRELL.

